Automatic underwater null steering

Band pass filter

Beamformer

Boom event analyzer recorder

Broadband adaptive doppler estimator and canceller

Broadband sonar signal processor and target recognition system

Channel impulse response estimation

Current source preamplifier for hydrophone beamforming

CW sonar with adaptive notch reverberation filter

Data acquisition system including data transmission controller f

Detection method and apparatus

Digital computer algorithm for processing sonar signals

Digital echo canceller

Doppler compensator for heterodyne correlation devices

Echo canceller with short processing delay and decreased multipl

Echo detection

Electric signal transfer element

Electrical firing circuit

Enhanced adaptive statistical filter providing improved performa

Enhanced adaptive statistical filter providing improved performa